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hi,looking at building another trike using a 1500se with a triumph tr7 diff with a ratio of 3.9-1.

any idea what 3.9-1 means and if it will be ok on the 1500?

cheers,Basher
 

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3.9 to 1 means the drive shaft turns 3.9 revolutions for every 1 that the axle turns.I believe that the 1500 has a stock ratio of 2.8/1 which means to get the same speed per engine RPM your going to need a larger rear tire.

Steve
 
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